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Had my mac since September now but this problem has only just started happening. For some reason, the sound will work on some things but not on others eg, when I play a WMV file on windows media player, the sound wont work, but when I play it on quicktime, it has sound, but when I play an MPEG file, the sound wont work on quicktime?!
And the radio 1 widget doesnt have sound in the dashboard and some online games dont have sound!?! This is the first time its happend and its really bugging me.